Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"desulphurisation"”.
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Desulphurisation of iron-carbon melts.
Desulphurisation of iron-carbon melts by CaO-FeO-SiO2 slags (Fayalite to 38 mass % CaO-Fayalite) at 1300 C has been investigated under conditions similar to those encountered in LD steelmaking practice. Techniques were developed to introduce a single metal droplet into a liquid slag contained in an …
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Desulphurisation of fine coal waste tailings using algal lipids
… is the two-stage flotation method developed for desulphurisation of hard rock tailings and coal fines, developed at the University of Cape Town. On desulphurising coal, the first stage produces an upgraded coal product that may be sold, with the second stage used to separate the tailings from the …
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Desulphurisation flotation for the selective removal of pyrite from coal discards using microorganisms
… time presents a major environmental risk. The desulphurisation of coal discards, mine tailings and finely divided waste rock prior to their disposal has been proposed as a method of preventing ARD formation. This involves the selective separation of residual values from the waste rock, followed …
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Life cycle assessment of the production of xanthate salts and of their application for ARD mitigation
… xanthate has also been used in the environmental desulphurisation flotation of sulphidic mine tailings and coal waste, with a view to mitigating acid rock drainage (ARD) risks through the pre-disposal removal of sulphide minerals. In South Africa, xanthate salts are produced by Senmin® …
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An economic analysis of coal desulpharisation by froth flotation to prevent acid rock drainage (ARD) and an economic review of capping covers and ARD treatment processes
… This project proposes ARD prevention by desulphurisation of sulphide rich waste coal material as an in-process approach which can be incorporated into mineral process flowsheets or as an add-on process for desulphurisation of old workings. The two stage flotation may yield a valuable …
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Acid biodesulphurisation of coal discards using a heap leaching approach
… test the feasibility and efficacy of accelerated desulphurisation as an ARD prevention method. The study was conducted in laboratory-scale columns simulating waste heaps over a period of 380 days, using coal discards from the Emalahleni region of Mpumalanga, South Africa. The results demonstrated …
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Alkaloid syntheis via novel azabicycles.
… in good yields. Desulphurisation gave 5,6,7,7a-tetrahydro-1-methyl-3H-pyrrolizin-5-one which has previously been converted into (+/-)-supinidine. Thus our method constitutes a formal total synthesis of (+/-)-supinidine.Attempts at the preparation of analogues of …
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Gas distribution in shallow packed beds
… adsorbents) and new applications (i.e. flue gas desulphurisation); the aspect ratio (height to diameter) of such beds is decreasing. Obtaining uniform gas distribution in such beds is of crucial importance in minimising operating costs and optimising plant performance. Since to some extent a …
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Attacking Ras-driven cancers: Engineering a peptide inhibitor for Cdc42
… The most successful approach involved desulphurisation of the disulphide bond to a thioether, making the cyclic linkage non-labile in the reducing environment of the cytosol, while retaining original binding affinity. The peptides developed in this work bind to Cdc42 with nanomolar …
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Soft Soil Stabilisation Using a Novel Blended Cementitious Binder Produced From Waste Fly Ashes
… under physico-chemical activation using flue gas desulphurisation (FGD) gypsum, for use in soft soil stabilisation. The effects of different binders produced from unary (WPSA), binary (WPSA and POFA) and ternary (WPSA, POFA and RHA) blended mixtures, along with ground and FGD gypsum activated …
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Characterisation and properties of alkali activated pozzolanic materials.
… and this produces fly and bottom ash, flue gas desulphurisation (FGD) gypsum. However, less than 25% of the total ash from power stations has found an industrial use mainly in cement and concrete industry. This creates a massive waste-disposal problem. Disposal of unused fly ash in open tips and …
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The economics of future membrane desalination processes and applications
… as the treatment of waste waters from flue-gas desulphurisation and coal-bed methane production, merit accelerated investigation. Incumbent technologies for the recycling of water produced from shales are currently inefficient and expensive. A study of electrodialysis energy requirements and …
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Measuring the social costs of coal-based electricity generation in South Africa
English: Energy technologies interact with the economic, social and environmental systems, and do so not only directly but indirectly as well, through upstream and downstream processes. In addition, the interactions may produce positive and negative repercussions. To make informed decisions on the …
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Chemische Heißgasreinigung bei Biomassevergasungsprozessen
The German goverment decided to increase the percentage of renewable energy up to 20% of all energy consumed in 2020. The development of biomass gasification technology is advanced compared to most of the other technologies for producing renewable energy. So the overall efficiency of biomass …